Hi Akash

The UAS does respond to INVITE with Supported: timer, with a 4xx if the
interval is too short or responds with a 2xx.  Why do you think there
should be an early update? u mean a 1xx response?

On Fri, Dec 4, 2020 at 12:05 PM akashdeep vishnoi <akashanshu...@gmail.com>
wrote:

> In initial Invite request, UAC is sending a Session-Expires header. After
> receiving this request, UAS will know that session timer negotiation is
> ongoing.
> Can UAS send an early update with a different value in Session-Expires?
>
> Thanks,
> Aakash
>
> On Fri, 4 Dec 2020, 22:40 Ranjit Avasarala, <ranjitka...@gmail.com> wrote:
>
>> Hi Aakash
>>
>> how will UAC or UAS know if another negotiation for session timer is
>> ongoing? do u mean multiple INVITEs are sent from UAC?
>>
>> Regards
>> Ranjit
>>
>> On Fri, Dec 4, 2020 at 11:01 AM akashdeep vishnoi <
>> akashanshu...@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I have a little confusion in this :
>>> --------------------------------
>>> Errata ID: 4744
>>> Status: Reported
>>> Type: Technical
>>> Publication Format(s) : TEXT
>>> Reported By: Chao Wang
>>> Date Reported: 2016-07-19
>>>
>>> Section 3 says:
>>>  A UAC starts by sending an INVITE. This includes a Supported header
>>> field
>>> with the option tag 'timer', indicating support for this extension
>>>
>>> It should say:
>>> A UAC starts by sending an INVITE. This includes a Supported header field
>>> with the option tag 'timer', indicating support for this extension.If UAC
>>> or UAS knows one negotiation of session timer is ongoing, it SHALL not
>>> start a new one.
>>>
>>>
>>>
>>> -------------------------------------------------------------------------------
>>> As per above explanation, I want to know if* Session Expire timer value
>>> can
>>> be changed by UAS/UAC by sending early UPDATE* before Call is established
>>> when INVITE request already has one timer value.
>>>
>>> Thanks,
>>> Aakash
>>> _______________________________________________
>>> Sip-implementors mailing list
>>> Sip-implementors@lists.cs.columbia.edu
>>> https://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
>>>
>>
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